Door-check.



' 11m PATENTED SEPT. 1, 1908.

M. J. mmm. DOOR CHECK APPLIOATON FILED .TUNE Z4, 1906. BENBWED FEB. 3,1908.

.t 'le manner indicated in Fig. 2.

UNTTED s TATEs PATENT oral.'

MICHAEL J. FLYNN, or New YORK, N. Y., AssIeNoR 'O F .ONE-HALF To EDWARDw. MCcAnTY, or BROOKLYN, NEW YORK.

DOOR-CHECK.

Specicaton of Letters Patent.

Patented sept. 1, 190e.

. Application tiled June' 24, 1905, .Serial No. 266,737. B eneweiFebruary 8, 1908. .Serial No. 414,059.

To all whom may concern."

Be it known that I, MicnAEn J FLYNN, a citizen of the United States,residing at the city of New York, in the 4borough-of Brooklyn and Stateof New York, have invented certain new and useful lm )rovements inDoor-Checks, of which the fol owing is a full, clear, and exactdescription.

My inventio11,relates to door checks, and has articular reference to theprovision of a checljr which is concealed within the door frame or jamb.

A further ob'ect of the invention is to provide a check wliich allowsthe door to swing freely during its inward movement, exerting atemporary check for a short distanceonly, as the door approaches itsclosed relation.

In the drawings, Figure l is a sectional view showing the door partlyclosed Fig. v2 is a similar view showing the door in its l'ully closedrelation.

v. In carr ing o'ut my invention 1l make use of Aa tubu ar casing insetinto the door j'amh, and having aflexible connection rod attached to thedoor, 'and -spring pressed inwardly within said casing. I also attach achecking cylinder tothe inner end of said connection 'rod which impedesits movement as theldoor approaches lts closed relation. For thispurpose the connection rod is resilient in the direction ol' its length,and capable of transmitting the compression stresses incident to saidchecking action. I V

.Referring tothe drawings, 1 denotes the door hinged to thejamb 2, atthe point 3, and having an anchorage 4 therein, with a tubular extension5. 'lhc anchorage has a llange (i by which it is secured in place. i

A7 denotes a socket contained within the, anchorage and -secured inplace by a pin 1() having a milled head 1.1, and passed through anopening 9, and the walls of said tube 5.

12 denotes thc connor-,tion rod conveniently formed of resilient steelwire cable, having a ball 13 contained within a rounded part 14 of thesocket 7. 'lh'c connection rod extends into the tubular casing 16 withina recess 15'in the door jamb, and is guided to move centrally thereof byantil'riction rollers 17 and 172. v The headv 21 of the checking clinder is soldered to the connection rod in 19 designates a line spiralspring upon the connection rod 12, which prevents the strands fromspreading in use. At the inner end ol' the cylinder is arranged a head22 against whicha powerful returning spring 2() bears, so as to nnpelthe cylinder and the connection rod 12 1n a direction to close the door.

24 designates a -iston rod passed through the head 22, Whiclll has agland or stulii'ng box 25 in order to make a water tight joint.

26 indicates an enlargement on the piston .rod against which presses thespring 27 tendring to press the piston rod outward.

28 designates the piston which is not tight upon the piston rod, butloosely surrounds a redua-ed portion' 3() thereof, and is capable oflongitudinal movement until it abuts against the shoulder 29. Therelation is such that when the motion of the piston rod impels theiiston against the shoulder 2S), a water tight Joint is formed, butunder other conditions the lluid is able to pass freely through theloose connection between the piston and piston rod.

Au additional feature. of the invention re,- latcs to the bore ol' thechecking cylinder,

ton at one end, as shown at 3d, but is considerably enlarged at itsother end, as indicated -at 32. '.lhc` piston is lillcd with glycerin orother viscous fluid through a duct 33, having a screw 34, bywhich it isclosed.

35 indicates a hole through the outcr casing, by which the screw isremoved.

' The operation is as follows: 'lhe door being open in the relationshown in Fig. 1, theI connection rod 12 is withdrawn outward so that thechecking cylinder occu )ies a position near the open end of the tu )e orcasing 16. In this relation the pistoni rod 24 is fully projected 4fromthe checking cylinder, but it is not long enough to reach the inner wallof the tubular casing under thesecircumstanccs. I influence ofthr'monnxection rod ilnpelled by the spring 20, the piston rodeventually abuts against the inner. -wal l ol thetubulaal1 casing sothat the momentum of the-door is checked,

cumstances, the 'door slowly approaches its latching position, and whenthe piston passes beyond the closely litting bore 3l the i'rce movementisresul'ned so that the door latches freely. When the door is opened,the `piston no longer lits closely against the As the door closesunderthe ,I

".lhis occurs when the door' is a few inches' irom latclung posit1on.`.Under these cir` ywhich is oi' a diameter to closely lit the pisistonrod. W at I claim, is 41. In a door check, a tubular casing adapt- V fedto be 'inset'.into the door j amb, a checking receive ,said ball, a

fss

cylinder contained therein, a closing spring for im elling-Said checkingcylinder inward,

a4 ,resiient connection rod secured to the checking cylinder and havingaball at'its free end, and an anchorage adapted to be secured to the doorand having a socket to Aloosely receive said ball.

2. In a door check, a casing adapted to be inset into the door jamb, achecking cylinder contained therein, a closing spring for impelling saidchecking cylinder inward, a resilient rod secured to the cylinder andhaving a hall thereon, an anchorage adapted to be secured to the doorand adapted to loosely iston rod projecting from said checking cyinderand arranged to impinge against the inner wall of said casing asthe checking cylinder movesinward, and means whereby'said piston rodaccelerates the checking action for only a portion of its movement intothe checking cylinder.

3. In a door check, a casing adapted to be inset into'the door jamb, achecking cylinder contained therein, a closing spring for impelling saidchecking cylinder inward, a piston rod projecting from the inner end ofsaid checking cylinder, and having a reduced portion within thecylinder,l a piston surroundling said reduced portion, and 'adapted tohave a limited'longitudinal movement upon said piston rod, said checkingcylinder havr 'ing a bore closely fitting saidpiston at one 40 end -andan enlarged bore at the other, a spring for`impelling said piston rodoutward from the checking cylinder, a connection rod secured to saidcylinder, and an anchorage adapted to receive said connection rod.

"4. lIn a door check, a casing adapted to be inset into the door jamb, achecking cylinder contained therein, a closing spring for iinpellingsaid checking cylinder inward, a piston rod projecting from saidcylinder and arranged to exert a resistance for a portion of its inwardmovement therein, a steel wire connection rod secured to said cylinder,and

means upon the door for removably receiving said connection rod.

5. In a door check',l a caslng adapted to be 4inset into the door amb, achecking cylinder contained therein, a closing spring for impelling saidchecking cylinder inward, a piston rod projecting from said cylinder andarranged to exert a resistance for a portion of its movement intothecylinder, a steel wire connection rod secured to said cyllnder, av

ball on said connection rod, and an anchorage upon the door arranged toremovably receive said ball.

6. In a door cheeka casing 'adapted to be f inset into the `door j amb,a checking cylinder contained therein, a closing spring for impellingsaid checking cylinder inward, a piston rod projecting from saidcylinder, va resilient steel wire cable connection rod secured to saidcylinder and projecting outwardly through the open end of said casing,antifriction rollers engaging said connection rod, and an anchorage uponthe door arranged to removably receive said connection rod.

In witness whereof, I subscribe my signature, in the presence of twowitnesses.

\ MICHAEL J. FIJYNN,

Witnesses;

WM. AM. S'rooigarnon, FRANK S. Onnn.

